+++ /dev/null
-/*
- * bay.c - ACPI removable drive bay driver
- *
- * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/notifier.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-#include <linux/seq_file.h>
-#include <asm/uaccess.h>
-#include <linux/platform_device.h>
-
-ACPI_MODULE_NAME("bay");
-MODULE_AUTHOR("Kristen Carlson Accardi");
-MODULE_DESCRIPTION("ACPI Removable Drive Bay Driver");
-MODULE_LICENSE("GPL");
-#define ACPI_BAY_CLASS "bay"
-#define ACPI_BAY_COMPONENT 0x10000000
-#define _COMPONENT ACPI_BAY_COMPONENT
-#define bay_dprintk(h,s) {\
- char prefix[80] = {'\0'};\
- struct acpi_buffer buffer = {sizeof(prefix), prefix};\
- acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
- printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
-static void bay_notify(acpi_handle handle, u32 event, void *data);
-
-static const struct acpi_device_id bay_device_ids[] = {
- {"LNXIOBAY", 0},
- {"", 0},
-};
-MODULE_DEVICE_TABLE(acpi, bay_device_ids);
-
-struct bay {
- acpi_handle handle;
- char *name;
- struct list_head list;
- struct platform_device *pdev;
-};
-
-static LIST_HEAD(drive_bays);
-
-
-/*****************************************************************************
- * Drive Bay functions *
- *****************************************************************************/
-/**
- * is_ejectable - see if a device is ejectable
- * @handle: acpi handle of the device
- *
- * If an acpi object has a _EJ0 method, then it is ejectable
- */
-static int is_ejectable(acpi_handle handle)
-{
- acpi_status status;
- acpi_handle tmp;
-
- status = acpi_get_handle(handle, "_EJ0", &tmp);
- if (ACPI_FAILURE(status))
- return 0;
- return 1;
-}
-
-/**
- * bay_present - see if the bay device is present
- * @bay: the drive bay
- *
- * execute the _STA method.
- */
-static int bay_present(struct bay *bay)
-{
- unsigned long sta;
- acpi_status status;
-
- if (bay) {
- status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
- if (ACPI_SUCCESS(status) && sta)
- return 1;
- }
- return 0;
-}
-
-/**
- * eject_device - respond to an eject request
- * @handle - the device to eject
- *
- * Call this devices _EJ0 method.
- */
-static void eject_device(acpi_handle handle)
-{
- struct acpi_object_list arg_list;
- union acpi_object arg;
-
- bay_dprintk(handle, "Ejecting device");
-
- arg_list.count = 1;
- arg_list.pointer = &arg;
- arg.type = ACPI_TYPE_INTEGER;
- arg.integer.value = 1;
-
- if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
- &arg_list, NULL)))
- pr_debug("Failed to evaluate _EJ0!\n");
-}
-
-/*
- * show_present - read method for "present" file in sysfs
- */
-static ssize_t show_present(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct bay *bay = dev_get_drvdata(dev);
- return snprintf(buf, PAGE_SIZE, "%d\n", bay_present(bay));
-
-}
-static DEVICE_ATTR(present, S_IRUGO, show_present, NULL);
-
-/*
- * write_eject - write method for "eject" file in sysfs
- */
-static ssize_t write_eject(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct bay *bay = dev_get_drvdata(dev);
-
- if (!count)
- return -EINVAL;
-
- eject_device(bay->handle);
- return count;
-}
-static DEVICE_ATTR(eject, S_IWUSR, NULL, write_eject);
-
-/**
- * is_ata - see if a device is an ata device
- * @handle: acpi handle of the device
- *
- * If an acpi object has one of 4 ATA ACPI methods defined,
- * then it is an ATA device
- */
-static int is_ata(acpi_handle handle)
-{
- acpi_handle tmp;
-
- if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
- (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
- (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
- (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
- return 1;
-
- return 0;
-}
-
-/**
- * parent_is_ata(acpi_handle handle)
- *
- */
-static int parent_is_ata(acpi_handle handle)
-{
- acpi_handle phandle;
-
- if (acpi_get_parent(handle, &phandle))
- return 0;
-
- return is_ata(phandle);
-}
-
-/**
- * is_ejectable_bay - see if a device is an ejectable drive bay
- * @handle: acpi handle of the device
- *
- * If an acpi object is ejectable and has one of the ACPI ATA
- * methods defined, then we can safely call it an ejectable
- * drive bay
- */
-static int is_ejectable_bay(acpi_handle handle)
-{
- if ((is_ata(handle) || parent_is_ata(handle)) && is_ejectable(handle))
- return 1;
- return 0;
-}
-
-#if 0
-/**
- * eject_removable_drive - try to eject this drive
- * @dev : the device structure of the drive
- *
- * If a device is a removable drive that requires an _EJ0 method
- * to be executed in order to safely remove from the system, do
- * it. ATM - always returns success
- */
-int eject_removable_drive(struct device *dev)
-{
- acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
-
- if (handle) {
- bay_dprintk(handle, "Got device handle");
- if (is_ejectable_bay(handle))
- eject_device(handle);
- } else {
- printk("No acpi handle for device\n");
- }
-
- /* should I return an error code? */
- return 0;
-}
-EXPORT_SYMBOL_GPL(eject_removable_drive);
-#endif /* 0 */
-
-static int acpi_bay_add_fs(struct bay *bay)
-{
- int ret;
- struct device *dev = &bay->pdev->dev;
-
- ret = device_create_file(dev, &dev_attr_present);
- if (ret)
- goto add_fs_err;
- ret = device_create_file(dev, &dev_attr_eject);
- if (ret) {
- device_remove_file(dev, &dev_attr_present);
- goto add_fs_err;
- }
- return 0;
-
- add_fs_err:
- bay_dprintk(bay->handle, "Error adding sysfs files\n");
- return ret;
-}
-
-static void acpi_bay_remove_fs(struct bay *bay)
-{
- struct device *dev = &bay->pdev->dev;
-
- /* cleanup sysfs */
- device_remove_file(dev, &dev_attr_present);
- device_remove_file(dev, &dev_attr_eject);
-}
-
-static int bay_is_dock_device(acpi_handle handle)
-{
- acpi_handle parent;
-
- acpi_get_parent(handle, &parent);
-
- /* if the device or it's parent is dependent on the
- * dock, then we are a dock device
- */
- return (is_dock_device(handle) || is_dock_device(parent));
-}
-
-static int bay_add(acpi_handle handle, int id)
-{
- acpi_status status;
- struct bay *new_bay;
- struct platform_device *pdev;
- struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
- acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);
-
- bay_dprintk(handle, "Adding notify handler");
-
- /*
- * Initialize bay device structure
- */
- new_bay = kzalloc(sizeof(*new_bay), GFP_ATOMIC);
- INIT_LIST_HEAD(&new_bay->list);
- new_bay->handle = handle;
- new_bay->name = (char *)nbuffer.pointer;
-
- /* initialize platform device stuff */
- pdev = platform_device_register_simple(ACPI_BAY_CLASS, id, NULL, 0);
- if (IS_ERR(pdev)) {
- printk(KERN_ERR PREFIX "Error registering bay device\n");
- goto bay_add_err;
- }
- new_bay->pdev = pdev;
- platform_set_drvdata(pdev, new_bay);
-
- /*
- * we want the bay driver to be able to send uevents
- */
- pdev->dev.uevent_suppress = 0;
-
- /* register for events on this device */
- status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- bay_notify, new_bay);
- if (ACPI_FAILURE(status)) {
- printk(KERN_INFO PREFIX "Error installing bay notify handler\n");
- platform_device_unregister(new_bay->pdev);
- goto bay_add_err;
- }
-
- if (acpi_bay_add_fs(new_bay)) {
- acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- bay_notify);
- platform_device_unregister(new_bay->pdev);
- goto bay_add_err;
- }
-
- /* if we are on a dock station, we should register for dock
- * notifications.
- */
- if (bay_is_dock_device(handle)) {
- bay_dprintk(handle, "Is dependent on dock\n");
- register_hotplug_dock_device(handle, bay_notify, new_bay);
- }
- list_add(&new_bay->list, &drive_bays);
- printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
- return 0;
-
-bay_add_err:
- kfree(new_bay->name);
- kfree(new_bay);
- return -ENODEV;
-}
-
-/**
- * bay_notify - act upon an acpi bay notification
- * @handle: the bay handle
- * @event: the acpi event
- * @data: our driver data struct
- *
- */
-static void bay_notify(acpi_handle handle, u32 event, void *data)
-{
- struct bay *bay_dev = (struct bay *)data;
- struct device *dev = &bay_dev->pdev->dev;
- char event_string[12];
- char *envp[] = { event_string, NULL };
-
- bay_dprintk(handle, "Bay event");
- sprintf(event_string, "BAY_EVENT=%d", event);
- kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
-}
-
-static acpi_status
-find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- int *count = (int *)context;
-
- /*
- * there could be more than one ejectable bay.
- * so, just return AE_OK always so that every object
- * will be checked.
- */
- if (is_ejectable_bay(handle)) {
- bay_dprintk(handle, "found ejectable bay");
- if (!bay_add(handle, *count))
- (*count)++;
- }
- return AE_OK;
-}
-
-static int __init bay_init(void)
-{
- int bays = 0;
-
- INIT_LIST_HEAD(&drive_bays);
-
- if (acpi_disabled)
- return -ENODEV;
-
- /* look for dockable drive bays */
- acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX, find_bay, &bays, NULL);
-
- if (!bays)
- return -ENODEV;
-
- return 0;
-}
-
-static void __exit bay_exit(void)
-{
- struct bay *bay, *tmp;
-
- list_for_each_entry_safe(bay, tmp, &drive_bays, list) {
- if (is_dock_device(bay->handle))
- unregister_hotplug_dock_device(bay->handle);
- acpi_bay_remove_fs(bay);
- acpi_remove_notify_handler(bay->handle, ACPI_SYSTEM_NOTIFY,
- bay_notify);
- platform_device_unregister(bay->pdev);
- kfree(bay->name);
- kfree(bay);
- }
-}
-
-postcore_initcall(bay_init);
-module_exit(bay_exit);
-
git://bbs.cooldavid.org / net-next-2.6.git / commitdiff